From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx157.postini.com [74.125.245.157]) by kanga.kvack.org (Postfix) with SMTP id C6DF56B0044 for ; Wed, 5 Dec 2012 16:47:54 -0500 (EST) From: Naoya Horiguchi Subject: [PATCH 2/3] HWPOISON, hugetlbfs: fix "bad pmd" warning in unmapping hwpoisoned hugepage Date: Wed, 5 Dec 2012 16:47:37 -0500 Message-Id: <1354744058-26373-3-git-send-email-n-horiguchi@ah.jp.nec.com> In-Reply-To: <1354744058-26373-1-git-send-email-n-horiguchi@ah.jp.nec.com> References: <1354744058-26373-1-git-send-email-n-horiguchi@ah.jp.nec.com> Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton , Andi Kleen Cc: Tony Luck , Wu Fengguang , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Naoya Horiguchi When a process which used a hwpoisoned hugepage tries to exit() or munmap(), the kernel can print out "bad pmd" message because page table walker in free_pgtables() encounters 'hwpoisoned entry' on pmd. This is because currently we fail to clear the hwpoisoned entry in __unmap_hugepage_range(), so this patch simply does it. Signed-off-by: Naoya Horiguchi --- mm/hugetlb.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git v3.7-rc8.orig/mm/hugetlb.c v3.7-rc8/mm/hugetlb.c index e61a749..fe7c2a7 100644 --- v3.7-rc8.orig/mm/hugetlb.c +++ v3.7-rc8/mm/hugetlb.c @@ -2387,8 +2387,10 @@ void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma, /* * HWPoisoned hugepage is already unmapped and dropped reference */ - if (unlikely(is_hugetlb_entry_hwpoisoned(pte))) + if (unlikely(is_hugetlb_entry_hwpoisoned(pte))) { + pte_clear(mm, address, ptep); continue; + } page = pte_page(pte); /* -- 1.7.11.7 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org